sorry i'm adding, i've read that superlative degree which contain syllable less than 3, isn't written using word "most". (eg. big becomes biggest, smart becomes smartest, certainly, funny becomes funniest)
One syllable adjectives normally take -er and -est. Three or more syllable adjectives normally take most. Two syllable adjectives can go either way, but some usually use -er and -est, while others usually use most. Funny is one that normally takes -er and -est.